FBI study on mass shootings

In a study of act­ive-shoot­er in­cid­ents, FBI of­fi­cials said there were 160 cases from 2000 through 2013, with the num­bers grow­ing from an av­er­age of 6.4 in­cid­ents in the first sev­en years to 16.4 in the last sev­en years.